linux-kernel - [PATCH 3/3] arm64: kdump: defer the crashkernel reservation for platforms with no DMA memory zones

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Message-Id: <20230324131838.409996-4-bhe@redhat.com>
Date:   Fri, 24 Mar 2023 21:18:38 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     catalin.marinas@....com, horms@...nel.org,
        thunder.leizhen@...wei.com, John.p.donnelly@...cle.com,
        will@...nel.org, kexec@...ts.infradead.org, ardb@...nel.org,
        rppt@...nel.org, linux-arm-kernel@...ts.infradead.org,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH 3/3] arm64: kdump: defer the crashkernel reservation for platforms with no DMA memory zones

In commit 031495635b46 ("arm64: Do not defer reserve_crashkernel() for
platforms with no DMA memory zones"), reserve_crashkernel() is called
much earlier in arm64_memblock_init() to avoid causing base apge
mapping on platforms with no DMA meomry zones.

With taking off protection on crashkernel memory region, no need to call
reserve_crashkernel() specially in advance. The deferred invocation of
reserve_crashkernel() in bootmem_init() can cover all cases.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 arch/arm64/include/asm/memory.h | 5 -----
 arch/arm64/mm/init.c            | 6 +-----
 2 files changed, 1 insertion(+), 10 deletions(-)

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 78e5163836a0..efcd68154a3a 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -374,11 +374,6 @@ static inline void *phys_to_virt(phys_addr_t x)
 })
 
 void dump_mem_limit(void);
-
-static inline bool defer_reserve_crashkernel(void)
-{
-	return IS_ENABLED(CONFIG_ZONE_DMA) || IS_ENABLED(CONFIG_ZONE_DMA32);
-}
 #endif /* !ASSEMBLY */
 
 /*
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 58a0bb2c17f1..b888de59e0b7 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -408,9 +408,6 @@ void __init arm64_memblock_init(void)
 
 	early_init_fdt_scan_reserved_mem();
 
-	if (!defer_reserve_crashkernel())
-		reserve_crashkernel();
-
 	high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
 }
 
@@ -457,8 +454,7 @@ void __init bootmem_init(void)
 	 * request_standard_resources() depends on crashkernel's memory being
 	 * reserved, so do it here.
 	 */
-	if (defer_reserve_crashkernel())
-		reserve_crashkernel();
+	reserve_crashkernel();
 
 	memblock_dump_all();
 }
-- 
2.34.1